Radiant energy – Ionic separation or analysis – Methods
Patent
1992-01-02
1993-07-20
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Methods
250288, H01J 4904
Patent
active
052296059
ABSTRACT:
Improvement to the process of elementary analysis of a specimen by high frequency inductively coupled plasma mass spectrometry, by means of an apparatus including a torch for producing plasma from a plasma producing medium and for injecting the specimen in this plasma and an interface for taking a sample in the specimen, comprising two consecutive conical members disposed along the same axis except that the conical members have angles with different apices and are each provided with an axial orifice enabling a fraction of the specimen to be analyzed to pass therethrough. According to the invention, a given quantity of a make-up gas is added to the specimen which is injected into the plasma, the make-up gas having a high heat producing power, so as to raise the temperature of the plasma for locally heating the sampling conical members thereby preventing the components of the specimen which are present in the plasma from depositing on the conical members. Preferably, the sampling conical members (18,19) are made of an alloy of niobium, hafnium, titanium.
REFERENCES:
patent: 4760253 (1988-07-01), Hutton
patent: 4804838 (1989-02-01), Miseki
patent: 4933650 (1990-06-01), Okamoto
patent: 4948962 (1990-08-01), Mitsui
Analytical Chem., vol. 57, No. 11, Nov. 1985, pp. 2674-2679, Wash.; J. A. Olivares et al., "Ion Sampling for Inductively Coupled Plasma Mass Spectrometry", p. 2675.
Analytical Chem., vol. 58, No. 1, Jan. 1986, pp. 97A-105A; R. S. Houk: "Mass Spectrometry of Inductively Coupled Plasmas".
Analytical Chem., vol. 52, No. 14, Dec. 1980, pp. 2283-2289; R. S. Houk et al.: "Inductively Coupled Argon Plasma as an Ion Source for Mass Spectrophotometric Determination of Trace Elements,"p. 2284, p. 2288, right column.
Bridenne Martine
Coffre Eric
Hutton Robert
Marot Yves
Berman Jack I.
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
V.G. Elemental Limited
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